Fabian Hueske created FLINK-4636:

             Summary: AbstractCEPPatternOperator fails to restore state
                 Key: FLINK-4636
                 URL: https://issues.apache.org/jira/browse/FLINK-4636
             Project: Flink
          Issue Type: Bug
          Components: CEP
    Affects Versions: 1.1.2, 1.2.0
            Reporter: Fabian Hueske
             Fix For: 1.2.0, 1.1.3

The {{restoreState()}} of the {{AbstractCEPPatternOperator}} restores the a 
Java {{PriorityQueue}}. For that it first reads the number of elements to 
insert and then creates a {{PriorityQueue}} object. However, Java's 
{{PriorityQueue}} cannot be instantiated with an initial capacity of {{0}}, 
which is not checked.
In case of an empty queue, the {{PriorityQueue}} should be instantiated with an 
initial size of {{1}}.


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